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Set XY_01 Puzzle 21

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Tue Mar 31, 2009 8:08 am    Post subject: Set XY_01 Puzzle 21 Reply with quote
Advanced. I suggest that you search for ways around using an XY-Chain.

Code:
 +-----------------------+
 | 1 . . | . 7 4 | 3 6 . |
 | . . . | 1 . 6 | . . 9 |
 | . . 7 | . 3 . | 2 . . |
 |-------+-------+-------|
 | . 4 . | . 9 . | . . . |
 | 2 . 3 | 5 . . | . . 6 |
 | 8 5 . | . . 3 | . . . |
 |-------+-------+-------|
 | 6 . 1 | . . . | 7 . . |
 | 3 . . | . . . | . . . |
 | . 8 . | . 5 . | . . 3 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site

Code:
   c4    Naked  Triple                   <> 289  [r68c4]
   c5    Naked  Triple                   <> 248  [r68c5]
 r9  b7  Locked Candidate 1              <> 4    [r9c8]

   c57   X-Wing                          <> 1    [r8c689]

         XY-Wing  [r6c7]/[r2c7]+[r4c9]   <> 8    [r3c9],[r5c7]

         Skyscraper c25\r7               <> 2    [r1c4],[r2c3]
         Empty Rectangle c5b6            <> 8    [r7c9]
         Empty Rectangle r4b9            <> 8    [r8c6]

 W-Wing: 9/2 in r7c2,r8c6 connected by 2 in r9c36 => r7c6<>9
 W-Wing: 4/1 in r3c8,r6c7 connected by 1 in r34c9 => r5c8<>4
 Bivalue Universal Grave + 1 => r8c9<>2, r8c9<>8


Last edited by daj95376 on Tue Apr 07, 2009 4:10 pm; edited 1 time in total
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Tue Mar 31, 2009 3:38 pm    Post subject: Reply with quote
In retrospect, I think this puzzle is going to be more of a grind than fun. Sad
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Tue Mar 31, 2009 10:18 pm    Post subject: Reply with quote
I finished it in eight steps, one of which was a xy-wing with an extended three cell pseudo-cell that might better be called a chain, but I found it looking for a xy-wing.

I think this puzzle was very similar to T_03 Puzzle 10 that was posted several days ago. Another BBDB!

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Apr 01, 2009 4:34 am    Post subject: Reply with quote
I used seven ordinary moves, the last two being an M-Wing on 14 with pincer transport and simple coloring on 8.
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